Pneumatic shoe



Jan. 9', 1934. A. scHFFl-:R

PNEUHATIC SHOE JN Filed Aug. l5, 1931` 114111,1111111111111'llllrllllllll 11,111.

lllllillllllllll/lllll/ll Patented jan. 9, i934 garantierter@ 4i (Claims.

rl.his invention relates to an improvement in shoes, which have an inflatable air cushion insert under the sole. The invention has for its object to prevent, when treading on the heel, the air from being forced towards the iront and the front part of the foot being thereby pressed tov gether.

An embodiment of the invention is illustrated by way of example in the accompanying drawing, in whichz- Fig. 1 shows a shoe according to the invention in cross section through the air valve.

Fig. 2 is a perspective View of the air cushion. Fig. 3 is a cross section through the shoe sole.

Fig. 4 is a perspective view of the inner sole.

Fig. 5 is a cross section of an inner sole for light shoes.

Fig. 6 shows a very light shce in cross section.

Fig. 7 is a perspective view of a nished shoe.

Fig. 8 is a cross section through the air valve.

The walking shoe according to the invention consists of an inner sole b having a recessed portion b', extending all round and corresponding to the thickness of the shoe upper e and of the welt l d. On the rear portion oi' the inner sole an embedded aluminium plate z with clips t (Fig. 4) is secured, Which reinforces the inner sole and facilitates the iitting of the valve casing parts i, '0. Under the inner sole b is the welt d and a leather plate c, about one millimetre in thickness, which is wider than the inner sole and, when molding the welt, bends with its edge on the rubber pad and serves for protecting the seam and rendering waterproof. The inner sole is sewn all round with the leather plate c at c'. The upper c is drawn into the recess d' of the inner sole on a last and then the upper edge of the welt d is placed at this point, after which the protecting plate c is tted and these four layers are sewn all round at c". The welt consists of a leather strip, which is mechanically pressed to the shape, illustrated in Fig. 1. The air cushion 1'?. is inserted in the recess of this welt. The air cushion has on its front half a continuous longitudinal slot d" (Figs. V2 and 3) and further towards the rear an aperture v" for accommodating the valve casing z'. The air cushion is inserted in such a manner that its valve aperture is hush with the corresponding holes in the inner sole b' and the protecting plate c, after which these four layers are held by screwing together the parts i, v. The sole-shaped protecting'plate g is then sewn all round to the welt d at d and subsequently the inner sole b, the plate c, the air cushion h and the protecting plate g are through (KCEu iid-29) stitched. by means of a seam h.' through the longitudinal slot d" so that an excessive swelling of the front portion of the air cushion is prevented, when the heel portion is trodden upon. The sole ,f is then sewn at f' on to the protecting plate g and the welt d. In the case of repairs this outer seam f is opened up, .whereas the inner seam d and the air cushion remain untouched.

In the case of lightsummer shoes the thin inner sole b is composed of two layers, one of which layers b is of cardboard. The plate c is in this case omitted (Fig. 5).

In the case of very light shoes the plate c is omitted and the inner sole d is made so much wider that its edge can be bent upwards in weltshape and be directly sewn with the upper leather e, the sole j and the protection plate g. The valve casing part i is cast into theair cushion h.

The air valve body y is tightly screwed' into the screw-threaded bore k: of the valve casing.

1. A pneumatic shoe, comprising in combination with an upper, a sole, an insole, and a welt of a shoe, a rubber air cushion between said sole and inner sole, the insole being marginally rabbeted on its under side to accommodate in such rabbet the lower edge of' said upper, and the upper edge of said welt, and a projecting plate under said inner sole and extending out at its edge ,over the upper edge of said air cushion.

' 2. A shoe as speciiied in claim 1, comprising in combination with the air cushion, the inner sole and the plate under said inner sole, a protecting plate under said air cushion, said air cushion having in its front half a continuous longitudinal slot through which said inner sole and said plate under said inner sole are sewn to said plate under said air cushion to prevent the bulging of the front portion of the cushion.

3. A shoe as specified in claim' 1 in which the inner sole consists of two superposed united plates, the lower plate being smaller than the upper plate to form a projecting edge around the inner sole.

4. In a shoe as specied in claim 1, comprising in combination with the air cushion, the plate and the inner sole, a valve casing composed of two anged screw sleeves adapted to screw the one in the other, one of said sleeves being cast in said cushion and the other of said sleeves serving for pressing together said air cushion, said plate and said inner sole.

. ADOLF SCHAFFER. 

